rendertext2.cpp

#include <iostream>
#include <codecvt>
#include <iomanip>

#include <SDL2/SDL.h>

#include <ft2build.h>
#include FT_FREETYPE_H

constexpr char teststring[] {"Hello World"};
constexpr int WIDTH = 800;
constexpr int HEIGHT = 600;

FT_Library library;
FT_Face face;

int main(int argc, char** argv) {

    SDL_Init(SDL_INIT_EVERYTHING);

    SDL_Window* window = SDL_CreateWindow (	
		"Test Window",
		SDL_WINDOWPOS_UNDEFINED, 
		SDL_WINDOWPOS_UNDEFINED, 
		WIDTH, 
		HEIGHT, 
		0);
        
	SDL_Renderer* renderer;
	renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);

	std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> conv16;
    std::u16string str16 = u"\u0E40\u0E21\u0E37\u0E48\u0E2D\u0E01\u0E32\u0E23\u0E17\u0E48\u0E2D\u0E07\u0E40\u0E17\u0E35\u0E48\u0E22\u0E27\u0E41\u0E25\u0E30\u0E08\u0E2D\u0E07\u0E17\u0E35\u0E48\u0E1E\u0E31\u0E01";//conv16.from_bytes(teststring);
 
    std::cout << "code points: \n";
    for (char16_t c : str16)
        std::cout << "\tU+" << std::hex << std::setw(4) << std::setfill('0') << c << '\n';

	std::cout<<std::dec;

	FT_Init_FreeType(&library);
	
	FT_New_Face(library, "test.ttf", 0, &face);
	FT_Set_Pixel_Sizes(face, 0, 64);
	
	std::cout<<"glyph indices:" <<std::endl;
	
	for (char16_t c : str16)
        std::cout << "\t" << FT_Get_Char_Index(face, c) << '\n';

	SDL_Color color;
	color.r = 0x80;
	color.g = 0xff;
	color.b = 0xaa;

    SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
	while (true) 
	{
		SDL_Event event;
		if (SDL_PollEvent(&event)) 
		{
			if (event.type == SDL_QUIT)	break;
		}

		SDL_SetRenderDrawColor(renderer, 0x50, 0x82, 0xaa, 0xff);
		SDL_RenderClear(renderer);

		SDL_RenderPresent(renderer);
		SDL_Delay(10);
	}

	FT_Done_Face(face);
	FT_Done_FreeType(library);

	SDL_DestroyWindow(window);
	SDL_Quit();

    SDL_Quit();
    return 0;
}